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Definition of Quellung reaction
1. Noun. The swelling of the capsule surrounding a microorganism after reaction with an antibody; the basis of certain tests for identifying microorganisms. "Pneumococcus quellung"
Medical Definition of Quellung reaction
1. Swelling of the capsule surrounding a bacterium as a result of interaction with anticapsular antibody, consequently the capsule becomes more refractile and conspicuous. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)
Lexicographical Neighbors of Quellung Reaction
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